// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_
#define CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_

#include <stdint.h>

#include "base/containers/hash_tables.h"
#include "content/browser/appcache/appcache_host.h"
#include "content/common/content_export.h"

namespace content {

class AppCacheServiceImpl;

class CONTENT_EXPORT AppCacheBackendImpl {
public:
    AppCacheBackendImpl();
    ~AppCacheBackendImpl();

    void Initialize(AppCacheServiceImpl* service,
        AppCacheFrontend* frontend,
        int process_id);

    int process_id() const { return process_id_; }

    // Methods to support the AppCacheBackend interface. A false return
    // value indicates an invalid host_id and that no action was taken
    // by the backend impl.
    bool RegisterHost(int host_id);
    bool UnregisterHost(int host_id);
    bool SetSpawningHostId(int host_id, int spawning_host_id);
    bool SelectCache(int host_id,
        const GURL& document_url,
        const int64_t cache_document_was_loaded_from,
        const GURL& manifest_url);
    void GetResourceList(
        int host_id, std::vector<AppCacheResourceInfo>* resource_infos);
    bool SelectCacheForWorker(int host_id, int parent_process_id,
        int parent_host_id);
    bool SelectCacheForSharedWorker(int host_id, int64_t appcache_id);
    bool MarkAsForeignEntry(int host_id,
        const GURL& document_url,
        int64_t cache_document_was_loaded_from);
    bool GetStatusWithCallback(int host_id, const GetStatusCallback& callback,
        void* callback_param);
    bool StartUpdateWithCallback(int host_id, const StartUpdateCallback& callback,
        void* callback_param);
    bool SwapCacheWithCallback(int host_id, const SwapCacheCallback& callback,
        void* callback_param);

    // Returns a pointer to a registered host. The backend retains ownership.
    AppCacheHost* GetHost(int host_id)
    {
        auto it = hosts_.find(host_id);
        return (it != hosts_.end()) ? (it->second.get()) : nullptr;
    }

    typedef base::hash_map<int, std::unique_ptr<AppCacheHost>> HostMap;
    const HostMap& hosts() { return hosts_; }

    // Methods to support cross site navigations. Hosts are transferred
    // from process to process accordingly, deparented from the old
    // processes backend and reparented to the new.
    std::unique_ptr<AppCacheHost> TransferHostOut(int host_id);
    void TransferHostIn(int new_host_id, std::unique_ptr<AppCacheHost> host);

    // PlzNaviate
    // The AppCacheHost is precreated by the AppCacheNavigationHandleCore class
    // when a navigation is initiated. We register the host with the backend in
    // this function and ignore registrations for this host id from the renderer.
    void RegisterPrecreatedHost(std::unique_ptr<AppCacheHost> host);

private:
    AppCacheServiceImpl* service_;
    AppCacheFrontend* frontend_;
    int process_id_;
    HostMap hosts_;

    DISALLOW_COPY_AND_ASSIGN(AppCacheBackendImpl);
};

} // namespace

#endif // CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_
